EP2700926B1 - Kontaktloser Drehmoment und Drehwinkelerkennungsvorrichtung und Messverfahren, das diese verwendet - Google Patents

Kontaktloser Drehmoment und Drehwinkelerkennungsvorrichtung und Messverfahren, das diese verwendet Download PDF

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Publication number
EP2700926B1
EP2700926B1 EP12189168.3A EP12189168A EP2700926B1 EP 2700926 B1 EP2700926 B1 EP 2700926B1 EP 12189168 A EP12189168 A EP 12189168A EP 2700926 B1 EP2700926 B1 EP 2700926B1
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EP
European Patent Office
Prior art keywords
transmission member
torque
angle
rotation
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP12189168.3A
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English (en)
French (fr)
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EP2700926A3 (de
EP2700926A2 (de
Inventor
Shang-Te Wu
Szu-Hsien Wu
Yi-Chang Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giant Electric Vehicle Kunshan Co Ltd
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Giant Electric Vehicle Kunshan Co Ltd
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Publication of EP2700926A3 publication Critical patent/EP2700926A3/de
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/14—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft
    • G01L3/1478—Rotary-transmission dynamometers wherein the torque-transmitting element is other than a torsionally-flexible shaft involving hinged levers

Definitions

  • the present invention relates to torque sensing technology and more particularly, to a non-contact type torque and angle of rotation sensing device for use in any torque transmission device to measure the torque on the torque transmission device and the angle of rotation of the torque transmission device in a non-contact manner.
  • the invention relates also to a torque and angle of rotation measurement method using the non-contact type torque and angle of rotation sensing device.
  • an electric bicycle further comprises a battery, a drive motor, a controller, a torque sensor and other electronic control components.
  • the torque sensor of the electric bicycle When riding an electric bicycle, the torque sensor of the electric bicycle will measure the rider's pedaling force and provide a corresponding signal to the controller, enabling the controller to control the drive motor output power to the bicycle subject to the detected torque.
  • an auxiliary power can be automatically provided to drive the electric bicycle, enabling the rider to ride the electric bicycle with less effort.
  • a strain gauge may be installed in a pedal crank of an electronic bicycle to measure the deflection of the pedal crank, thereby providing an electrical signal indicative of the torque.
  • a strain gauge can be installed in a transmission component of an electronic bicycle to detect tiny deflection of the transmission component during torque transmission, thereby estimating the torque.
  • US6,644,135 discloses a torque sensor, entitled “Torque sensor for a bicycle bottom bracket assembly”, which comprises an axle supporting member for supporting the axle for rotation around a support axis, and four pressure sensors mounted on the axle supporting member. During rotation of the bottom bracket axle, the torque is directly transmitted to the axle supporting member, causing each pressure sensor to generate a corresponding pressure. The generated pressure is then converted into torque.
  • the aforesaid conventional torque sensing devices commonly use a strain gage or pressure sensor in direct contact with the mounting location to convert the deflection rate of the structure of the mounting location into torque.
  • the structural deflection state of the mounting location varies with the composition of the material of the structure of the mounting location and its manufacturing process, causing the strain gage unable to accurately measure the actual torque value.
  • WO 2012/108477 A1 discloses a torque detecting apparatus for providing a torque detecting device capable of reducing the size in the direction perpendicular to the axial direction of the first sahft in the torque detecting device.
  • the conventional torque sensing devices commonly have a complicated structure, or will be directly exposed to the outside open air after installation. Therefore, conventional torque sensing devices cannot take into account the installation requirements of simplicity and sense of beauty.
  • the present invention has been accomplished under the circumstances in view. It is the main object of the present invention to prove a non-contact type torque and angle of rotation sensing device, which can accurately measure the torque and is easy to install.
  • a non-contact type torque and angle of rotation sensing device for measuring a torque being applied to rotate a transmission member and the angle of rotation of the transmission member in a first axial direction.
  • the non-contact type torque and angle of rotation sensing device comprises a magnetic member, a plurality of sensing members and a computing unit.
  • the magnetic member is mounted on the transmission member and rotatable with the transmission member by the torque being applied to the transmission member.
  • the magnetic member comprises a first center.
  • the magnetic member is deflectable relative to the transmission member in a predetermined direction in a nonparallel manner relative to the first axial direction to create an amount of deflection between the first center of the magnetic member and the first axial direction of the transmission member during rotation of the transmission member by the applied torque.
  • the sensing members are adapted to commonly detect a magnetic field variation created and to output a respective electrical signal during rotation of the magnetic member.
  • the electrical signals outputted by each two sensing members exhibit a phase difference. The amplitude of each electrical signal is directly proportional to the amount of deflection of the magnetic member.
  • the computing unit is adapted to receive the electrical signals outputted by the sensing members and to compute the amplitudes of the electrical signals, thereby obtaining the value of the torque being applied to the transmission member and the angle of rotation of the transmission member.
  • the invention is characterized in that the transmission member comprises a disc-like holder block which comprises an elongated guide portion.
  • the magnetic member further comprises a coupling groove accommodating the elongated guide portion.
  • the coupling groove has a width greater than the length of the elongated guide portion.
  • the sensing device further comprises a driving member mounted on the transmission member and at least one flexible connection rod connecting the driving member to the disc-like holder block.
  • the driving member further comprises a push portion detachably abutted against the magnetic member.
  • each sensing member senses the approach of a sine wave to induce an electrical signal (the transverse coordinate of the sine wave is the angle of rotation).
  • the electrical signals of the sensing members change subject to the angle of rotation, the amplitude of the sine wave can be accurately estimated at any angle due to the phase difference relationship among the electrical signals provided by the sensing members, and therefore the applied torque can be further estimated.
  • the non-contact type torque and angle of rotation sensing device further comprises a driving member mounted on the transmission member, comprising a push portion detachably abutted against the magnetic member.
  • the sensing members are arranged on one same plane and spaced from one another at a predetermined interval.
  • a non-contact type torque and angle of rotation sensing device 10 in accordance with the present invention is shown mountable on a transmission member 20 that is rotatable by a torque.
  • the transmission member 20 can be a transmission axle of a vehicle, sports equipment or any of a variety of other mechanical mechanisms.
  • the transmission member 20 is a bottom bracket axle of an electric bicycle that can be rotated around a support axis in a first axial direction 22 when a rider pedals the pedals of the electric bicycle.
  • the transmission member 20 is inserted through a disc-like holder block 24 that has an elongated guide portion 26 protruded from its one side.
  • the non-contact type torque and angle of rotation sensing device 10 comprises a magnetic member 30 and a plurality of sensing members 40.
  • the magnetic member 30 is ring magnet having a center hole 32 defining a first center 34, an accommodation space 36 radially extended from the center hole 32, and an elongated groove 38 located on one side thereof and facing toward the disc-like holder block 24.
  • the elongated groove 38 has a width greater than the length of the elongated guide portion 26.
  • the elongated groove 38 can be made in the form of a slot cut through the two opposite sides of the magnetic member 30.
  • the transmission member 20 is inserted through the center hole 32 of the magnetic member 30 and attached with its one side to the disc-like holder block 24 to have the elongated guide portion 26 be accommodated in the elongated groove 38. Further, a driving member 50 is mounted on the transmission member 20 at the other side of the magnetic member 30.
  • the driving member 50 comprises a coupling ring 52 sleeved onto one end of the transmission member 20, an extension portion 54 extended from the outer perimeter of the coupling ring 52 and suspending in the accommodation space 36, and a push portion 56 located on the distal end of the extension portion 54 and stopped against the peripheral wall of the accommodation space 36. Further, two flexible connection rods 58 are inserted through the center hole 32 and connected between the coupling ring 52 and the disc-like holder block 24.
  • the driving member 50 and the corresponding one end of the transmission member 20 are rotated by a torque produced during pedaling of the bicycle rider, the other end of the transmission member 20 can then be forced to rotate the chain wheel (not shown).
  • the push portion 56 of the driving member 50 is stopped against the magnetic member 30 and the flexible connection rods 58 are connected between the driving member 50 and the disc-like holder block 24, and therefore the magnetic member 30 and the disc-like holder block 24 are simultaneously rotated during rotation of the transmission member 20.
  • the driving member 50 and the disc-like holder block 24 twist the two flexible connection rods 58, causing a deflection between the driving member 50 and the disc-like holder block 24.
  • the magnetic member 30 rotates with the transmission member 20 and deflects relative to the transmission member 20 in a direction along the elongated guide portion 26 in a nonparallel manner relative to the first axial direction 22.
  • the magnetic member 30 moves a direction perpendicular to the first axial direction 22 , resulting in an amount of deflection D between the first center 34 of the magnetic member 30 and the first axial direction 22 of the transmission member 20. This amount of deflection D is directly proportional to the torque.
  • the sensing members 40 can be Hall sensors or giant magnetoresistive (GMR) sensors. As shown in FIG. 2 , two sensing members 40 are arranged adjacent to the magnetic member 30. According to the present preferred embodiment, these two sensing members 40 are mounted on the inside wall of the bottom bracket axle of an electric bicycle on one same plane at a predetermined interval, for example, the these two sensing members 40 are kept apart at 30 °, 45 °, 60 ° or 90° angle. These two sensing members 40 are adapted to sense the magnetic field variation during rotation of the magnetic member 30 with the transmission member 20 and to output a respective electrical signal indicative of the sensed magnetic field variation to a computing unit 60. The aforesaid magnetic field variation is directly proportional to the amount of deflection D.
  • GMR giant magnetoresistive
  • the computing unit 60 Upon receipt of the electrical signals from the sensing members 40, the computing unit 60 converts the electrical signals into digitals by means of a formula built therein, and then composes the digitals thus obtained into a waveform curve.
  • the magnetic member 30 when the magnetic member 30 is being forced by a torque to produce an amount of deflection D that is directly proportional to the applied torque, the magnetic member 30 is rotated with the transmission member 20 in an eccentric manner. Because the two sensing members 40 are immovable, the distance between the magnetic member 30 and each sensing member 40 will be alternatively increased and reduced subject to change of the angle of rotation during rotary motion of the magnetic member 30 on the first axial direction 22. Thus, as shown in FIG. 11, the electrical signals provided by the two sensing members 40 subject to the variation of the magnetic field created by the magnetic member 30 can be converted into near-sinusoidal waveforms of curve A and curve B with a predetermined phase difference therebetween.
  • the curves A;B shown in FIG. 7 will be more closer to sine waves.
  • the amplitude of the sine waves is directly proportional to the amount of deflection of the magnetic member 30. The greater the amount of eccentricity is, the greater the amplitude will be. If the amount of deflection is zero, the amplitude will also be zero.
  • the invention mainly uses two sensing members 40 to detect the variation of the magnetic field created by the magnetic member 30 and then to create two sine wave curves A;B that have a phase difference therebetween. Subject to the amplitude of these two curves A;B, the torque value is calculated.
  • the transmission member 20 and the magnetic member 30 are both to withstand the applied torque and the sensing members 40 do not touch the transmission member 20, and therefore, the amount of deflection of the magnetic member 30 is directly related to the amount of the applied torque without causing any change subject to the material properties of the transmission member 20 or the other related components.
  • the measurement result of the present invention is direct and more sensitive than prior art techniques.
  • the invention accurately estimates the applied torque.
  • the structural design and mounting arrangement of the magnetic member 30 and the sensing member 40 can be changed to fit different application requirements. Even for use in a narrow space inside a bottom bracket axle of a bicycle, or for application to fit the outer appearance of a product or to match with the positioning of a power source, the non-contact type torque and angle of rotation sensing device of the present invention can be conveniently adjusted and installed for high-performance sensing application.
  • the measurement result will be more accurate. Further, except for the purpose of torque measurement, also the angle and speed of rotation of the transmission member can be measured.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Claims (4)

  1. Kontaktlose Drehmoment- und Winkelrotations-Erfassungseinrichtung (10) zur Erfassung eines Drehmoments, das zur Rotation eines Übertragungselements (20) darauf angelegt wird, und des Rotationswinkels des Übertragungselements (20) in eine erste axiale Richtung (22), worin die kontaktlose Drehmoment- und Winkelrotations-Erfassungseinrichtung (10) umfasst:
    ein magnetisches Element (30), das auf dem Übertragungselement (20) befestigt und mit dem Übertragungselement (20) durch das an dem Übertragungselement (20) angelegte Drehmoment drehbar ist, worin das magnetische Element (30) ein erstes Zentrum (34) umfasst, worin das magnetische Element (30) relativ zu dem Übertragungselement (20) in eine bestimmte, relativ zu der ersten axialen Richtung (22) nicht-parallel verlaufende Richtung ablenkbar ist, um während der durch das angelegte Drehmoment hervorgerufenen Rotation des Überragungselements (20) zwischen dem ersten Zentrum (34) des nichtmagnetischen Elements (30) und der ersten axialen Richtung (22) des Übertragungselements ein Grad an Ablenkung (D) zu erzeugen,
    mehrere Erfassungselement (40), die angepasst sind, zusammen eine hervorgerufene Änderung eines magnetischen Feldes zu erfassen, und während der Rotation des magnetischen Elements (30) ein entsprechendes elektrisches Signal auszugeben, wobei die von jeweils zwei Erfassungselementen (40) ausgegebenen elektrischen Signale (40) einen Phasenunterschied anzeigen, wobei die Amplitude eines jeden elektrischen Signals direkt proportional ist zu dem Grad der Ablenkung (D) des magnetischen Elements (30); und
    eine Rechnereinheit (60), die angepasst ist, die von den Erfassungselementen (40) ausgegebenen elektrischen Signale zu empfangen und die Amplituden der elektrischen Signale zu berechnen, wodurch der Wert des an dem Übertragungselement (20) angelegten Drehmoments und des Rotationswinkels des Übertragungselements (20) erhalten wird;
    dadurch gekennzeichnet,
    dass das Übertragungselement (20) einen Scheiben-ähnlichen Halterungsblock (24) umfasst, der einen länglichen Führungsbereich (26) umfasst, worin das magnetische Element (30) eine Kupplungsnut (38) umfasst, die den länglichen Führungsbereich (26) aufnimmt, worin die Kupplungsnut (38) eine Weite aufweist, die größer ist als die Länge des länglichen Führungsbereichs (26); und
    dass die Erfassungseinrichtung weiter ein Antriebselement (50) umfasst, das auf dem Übertragungselement (20) befestigt ist und mindestens einen flexiblen Verbindungsstab (58) umfasst, der das Antriebselement (50) mit dem Scheiben-ähnlichen Halterungsblock (24) verbindet, worin das Antriebselement (50) einen Drückbereich (56) umfasst, der auf dem magnetischen Element (30) abnehmbar aufliegt.
  2. Kontaktlose Drehmoment- und Winkelrotations-Erfassungseinrichtung (10) nach Anspruch 1, worin die Erfassungselemente (40) in der gleichen Ebene angeordnet und voneinander in einem bestimmten Intervall beabstandet sind.
  3. Kontaktlose Drehmoment- und Winkelrotations-Erfassungseinrichtung (10) nach Anspruch 3, worin das bestimmte Intervall zwischen jeweils zwei Erfassungselementen (40) ein 90° Winkel ist.
  4. Erfassungsverfahren unter Verwendung der kontaktlose Drehmoment- und Winkelrotations-Erfassungseinrichtung (10) nach Anspruch 1, welches die Schritt umfasst:
    a. Anlegen eines Drehmoments an das Übertragungselement (20), so dass das magnetische Element (30) mit dem Übertragungselement (20) gedreht wird, und Erzeugen eines Grads an Ablenkung (D) und einer Änderung des magnetischen Felds;
    b. Verwenden der Erfassungselemente (40) um die Änderung des magnetischen Felds zu erfassen und ein entsprechendes elektrisches Signal auszugeben, das eine jeweilige Wellenform-Kurve anzeigt; und
    c. Verwenden einer trigonometrischen Funktionsgleichung um den Rotationswinkel und die Amplitude eines jeden elektrischen Signals zu berechnen und dann den berechneten Rotationswinkel und die Amplitude in den Wert des Drehmoments zu übersetzen, der an das Übertragungselement (20) angelegt wird.
EP12189168.3A 2012-08-23 2012-10-19 Kontaktloser Drehmoment und Drehwinkelerkennungsvorrichtung und Messverfahren, das diese verwendet Active EP2700926B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW101130685A TW201409005A (zh) 2012-08-23 2012-08-23 非接觸式扭力及旋轉角度感測裝置

Publications (3)

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EP2700926A2 EP2700926A2 (de) 2014-02-26
EP2700926A3 EP2700926A3 (de) 2014-08-20
EP2700926B1 true EP2700926B1 (de) 2016-06-29

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US (1) US8960021B2 (de)
EP (1) EP2700926B1 (de)
TW (1) TW201409005A (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI557400B (zh) * 2014-08-20 2016-11-11 Non - contact eccentric rotary torque sensing device
CN105444933A (zh) * 2014-09-29 2016-03-30 期美科技股份有限公司 扭力调整检测系统
PL3012181T3 (pl) * 2014-10-21 2019-07-31 Wuxi Truckrun Motor Co., Ltd. Układ napędowy ze środkowym silnikiem do roweru elektrycznego
US20160153852A1 (en) * 2014-12-02 2016-06-02 Mu-Chuan Wu Torque adjustment and measurement system
CN106153231B (zh) * 2015-04-21 2019-08-09 期美科技股份有限公司 扭力检测系统
TWI763366B (zh) 2021-03-12 2022-05-01 和碩聯合科技股份有限公司 扭力傳感器

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DE3912883C2 (de) * 1989-04-19 1997-01-23 Look Sa Vorrichtung zur Messung des auf ein antreibbares Rad ausgeübten Antriebsmomentes und/oder damit verbundener Größen
US5031455A (en) * 1989-09-05 1991-07-16 Cline David J Bicycle power meter
US5177432A (en) * 1991-05-31 1993-01-05 Ppg Industries, Inc. Wireless velocity detector for a bicycle having a rotating AC magnetic field and receiver coils
JP3079528B2 (ja) * 1996-02-28 2000-08-21 日本精機株式会社 回転検出装置
TW409104B (en) 1998-09-01 2000-10-21 Shimano Kk Torque sensor for bicycle and crankshaft assembly for bicycle
DE1181515T1 (de) * 1999-04-16 2002-08-22 Magna Lastic Devices Inc ZIRKULAR MAGNETISIERTER PLATTENFöRMIGER DREHMOMENTWANDLER UND VERFAHREN ZUR MESSUNG DES DREHMOMENTES MIT DEM WANDLER
JP3938902B2 (ja) * 2002-11-27 2007-06-27 株式会社ジェイテクト 角度検出装置及びそれを備えたトルクセンサ
TW200741186A (en) * 2006-04-17 2007-11-01 Jing-Long Ceng Torque sensor
EP2674739A4 (de) * 2011-02-08 2016-08-10 Jtekt Corp Drehmomentsensorvorrichtung

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Publication number Publication date
EP2700926A3 (de) 2014-08-20
TWI470198B (de) 2015-01-21
TW201409005A (zh) 2014-03-01
US8960021B2 (en) 2015-02-24
EP2700926A2 (de) 2014-02-26
US20140053661A1 (en) 2014-02-27

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